Well, that was kind of my point I should have expanded on. Facebook, Instagram, Snapchat, et al have a -lot- of interesting tech behind them. From "creepy" suggestion algorithms, calls/video calls, face filters for pics and videos...the list goes on and on. Sure another company could do it, but it's got a higher barrier to entry. Reddit has nothing interesting or proprietary. An unreliable clone would probably take a single person all of a day or two.